Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system

Ackermann T, Neumann E (1967)
Biopolymers 5(7): 649-662.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
The course of the reversible helix formation of poly(y-benzyl L-glutamate) (PBG) dissolved in a mixture of dichloroacetic acid (DCA) and 1,2-dichloroethane (EDC) was followed by measuring the heat capacity and the optical rotation of the system through the transition region. The results of these measurements indicate that the transition enthalpy H the transition temperature Tc, and the Zimm-Bragg parameter depend considerably on the PBG concentration as well as on the composition of the solvent. For the standard state of infinite dilution, however, a linear extrapolation of the measured H if values results in a standard value H = 950 cal./mole, independent of the solvent composition. The results of the calorimetric measurements are discussed in relationship to changes in optical rotation. Some peculiarities in the measured thermodynamic and optical properties in solutions with relatively high content of dichloroacetic acid are reported.
Stichworte
Biophysics; Biochemistry; Molecular biology
Erscheinungsjahr
1967
Zeitschriftentitel
Biopolymers
Band
5
Ausgabe
7
Seite(n)
649-662
ISSN
0006-3525
eISSN
1097-0282
Page URI
https://pub.uni-bielefeld.de/record/1774355

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Ackermann T, Neumann E. Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers. 1967;5(7):649-662.
Ackermann, T., & Neumann, E. (1967). Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers, 5(7), 649-662. doi:10.1002/bip.1967.360050706
Ackermann, T., and Neumann, E. (1967). Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers 5, 649-662.
Ackermann, T., & Neumann, E., 1967. Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers, 5(7), p 649-662.
T. Ackermann and E. Neumann, “Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system”, Biopolymers, vol. 5, 1967, pp. 649-662.
Ackermann, T., Neumann, E.: Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers. 5, 649-662 (1967).
Ackermann, Theodor, and Neumann, Eberhard. “Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system”. Biopolymers 5.7 (1967): 649-662.
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